I rememebr when the first Zunes came out and everyone looked at the brown colour and went "Whaaaat?!"
Some folks said brown was an "in" colour (lots of fashion designers were using brown that year), and that Microsoft was riding the crest of the coolness wave and differentiating the Zune from the white iPod.
Cue 2007... The new Zunes are out, and brown is nowhere to be seen...
The old Zunes are on deep clearance (e.g. $109 on Buy.com). What colour is left?
You guessed it : Brown!
When all life on earth is extinct, there will be "mint in box" brown Zunes left as a testament to Man's ingenuity.